Device



NOV," 9 11926. mama A. BOYNTON WELL CEMENTING DEVICE Filed Dec. 21 925 WITNESSES INVENTOR ATTORNEYS b We r ALEXANDER BOYNTON, OF SAN ANTONIO, TEXAS.

WELL-CEMENTING DEVICE.

Application filed December 21, 1935.

ention relates in general to a covice especially designed for use out the methods forming the quarter of my co-pendin applicailed October 1 1925, Serial Numbers and 5d 888 and more particularly the n invention relates to an improvement mblies used in such cementing present invention aims to pro on "Term of valve device of this 3 which is designed for cooperation a single valve seat in the well casing A w ich said valve seat sur- 1: ends under all circumstances thereby prevcntina the lurther How of cement at the r time and also causing the pump to to advise the operator that the cementain has been completed. Other objects and advantages reside in certain novel features or the construct-ion, marangcment and combination of parts w ich will be hereinafter more fully deand particularly pointed out in the ed claims reference being; had to the f lug drawings torn'iing a part of specification, and in which Figure l is a view partly in section and y in elevation showing one embodiie invention,

7 a sectional view on the line gure 1, 3e 3 is a similar view on the line 3-3 are 1, and Figure iis a fragmentary view in section wing how the particular form of sealing nber shown is expanded and deformed stop the flow-oil liquid in the event of the "f ire of the main valve seat.

errinp; to the drawings, the numeral 1 iates a cementing device of the type D the subject-matter of my copendapplication. executed under even date this application and identified as Case oer 1. In the present invention, howonly one valve seat 2 is employed. A valve assembly designated generally at 3, is provided and in ludes a main fixed valve 4- eving the form of a cup and integral or otherwise rigidly connected to the end of a valve sten 5. The valve stem nade up of a lower section 6 and an section 7 having a joint 8 connecting Sallie, The upper section 7 has a cup- -d head or member 9 fired thereto and serves as a guide in that it tends to fierial No. 76,842.

hold the valve assembly in substantially vertical position in the well casing. lvloreover, this cup-shaped member presents a surface which reacts to the pressure in that downward llow of fluid in the well casing tends to carry the member 9 with it. This tends to seat the main valve on the seat 2. Again, -e specific gravity of the valve assembly whole be approximately equal to or l'iat lighter than that of the mud fluid (t 1 1 error) the resistance which the cup-shaped member 9 presents to upward u'zovement of the valve assembly would be effective to prevent the valve assembly from in the mud fluid. A rubber sealing member 10 is mounted on the lower section 5 of the stem 5 and normally rests on the main valve 41-. This sealing member is made readily expansible rubber or other highly elastic substance and is in the storm of a hollow sphere having an opening 11 accommodating the stem and an upwardly presented opening 12 affording communication bet veen the fluid and the cementing device and its interior. The entire assembly is of such specific gravity that it is heavier than the mud fluid but lighter than the liquid cement.

use the valve assembly is placed on top of the cement and in accordance with the method and when the cement has practically all been pumped down through the re inenting device the main valve member 4:

will strike the seat 2. It the main valve member l properly engages the seat 2 the further flow of cement is prevented and the pump stalls. Should an obstruction prevent the proper seating of the valve or should such seating be prevented in any other way the down flow of the mud fluid would result in an expansion of the sealing member 10 causing it to lap over the valve in its seat and etlect the desired sea-ling action.

Figure t of the drawing illustrates obstructions O preventing the proper seating of the main valve member 4 and also shows how the auxiliary sealing member or auxiliary valve 10 is expanded and deformed to provide the requisite sealing action,

I claim 1. In a cementing device for use with well casings having a valve seat therein adjacent the point of discharge or" the cement a valve assembly having a specific gravity greater than the liquid cement and less than the lllf) mud fluid and comprising a main valve cooperable witlrth seat, andan 'expansible sealing member located adjacent the main valve and designed to be expanded by a flow of the fluid which follows the failure of the seating of the main valve.

2. In a cementing device for use with well casings having a valve seat tlierein adja cent the point of discharge of the cement, a valve assembly having a specific gravity greater than the liquid cement and less than the mud fluid and comprising a main valve co-operable with the seat, and an expansible sealing member located adjacent the main valve and designed to bevexpanded by a flow of the fluid which follows the failure of the seating of the main valve, said sealing member consisting of a hollow body of elastic material having an upwardly presented opening.

3, In a cementing device for use with well casings having a valve seat adjacent the point of discharge of the cement, a valve assembly having a specific gravity less than the liquid cement and greater than the mud fluid and comprising a main valve co-operable with the valve stem, astem connected at its lower end to saidmain valve, a guide at the upper end of the stem, and a hollow sealing member mounted on the stem and resting on the main valve and having an upwardly presented opening whereby it is designed to be expanded by the flow which follows thefailure of the main valve to seat.

4. In a cementing device for use with well casings having a valve seat adjacent the point of discharge of the cement, a valve assembly having a specific gravity less than the liquid cement and greater than the mud fluid and comprising a main valve cooperablewith the valve stem, a seat connected at its lower end to said main valve, a substantially cup-shaped member connected to the upper end of the stem, and a hollow sealing member mounted on the stem and resting on the main valve and designed to be expanded by the flow which follows the failure of the main valve to seat.

5. In a cementing device for use with well properly.

ALEXANDER BOYNTON. 

